Soy sauce factory waste heat recovery system

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a soy sauce factory waste heat recovery system which comprises a flash tank and an ejector, the flash tank is provided with a flash inlet, a flash steam outlet and a flash water outlet, and the ejector is provided with a high-pressure inlet, a low-pressure inlet and an ejection outlet. A flash evaporation inlet of the flash evaporation tank is used for being connected with a condensate water outlet of steam equipment, a flash evaporation steam outlet of the flash evaporation tank is connected with a low-pressure inlet of the ejector, a high-pressure inlet of the ejector is used for being connected with an external steam pipeline, and an ejection outlet of the ejector is used for being connected with a steam inlet of the steam equipment. According to the technical scheme, at least part of waste heat in the condensate water can be recycled, and pressure reduction equipment does not need to be additionally arranged for reducing the pressure of high-temperature and high-pressure steam.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and more specifically, to a waste heat recovery system for a soy sauce factory. Background Art

[0002] Existing soy sauce factories need to use high temperature and high pressure steam for production. Figure 2 Typically, high-temperature, high-pressure steam is transported to the soy sauce factory via an external steam pipe 200. It then passes through a pressure reducing device 300 to reduce the temperature and pressure before being supplied to the steam-consuming equipment 100. The steam-consuming equipment 100 has a steam inlet 101 and a condensate outlet 102. After passing through the pressure reducing device 300, the steam is supplied to the steam-consuming equipment 100 through the steam inlet 101. After being used by the steam-consuming equipment 100, the steam produces high-temperature, high-pressure condensate, which is discharged through the condensate outlet 102. Direct discharge of the steam would result in heat waste. Utility Model Content

[0003] In order to overcome the problem of waste heat of condensed water in soy sauce factories in the prior art, the utility model provides a soy sauce factory waste heat recovery system capable of recycling and utilizing the waste heat of condensed water.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a soy sauce factory waste heat recovery system, including: a flash tank and an ejector, the flash tank having a flash inlet, a flash steam outlet and a flash water outlet, the ejector having a high-pressure inlet, a low-pressure inlet and an ejection outlet, the flash inlet of the flash tank is used to connect to the condensed water outlet of the steam-using equipment, the flash steam outlet of the flash tank is connected to the low-pressure inlet of the ejector, the high-pressure inlet of the ejector is used to connect to an external steam pipeline, and the ejection outlet of the ejector is used to connect to the steam inlet of the steam-using equipment.

[0005] In the technical solution of this utility model, condensed water generated by steam-consuming equipment is flash-evaporated (i.e., evaporated under reduced pressure) in a flash tank, producing hot water and steam at atmospheric pressure. The resulting steam is then mixed with high-temperature, high-pressure steam in an external steam pipeline through an ejector, raising its pressure to form steam that can be used by the steam-consuming equipment. This allows for the recovery of at least some of the waste heat in the condensed water, while also eliminating the need for additional pressure-reducing equipment to reduce the pressure of the high-temperature, high-pressure steam.

[0006] Furthermore, the soy sauce factory waste heat recovery system also includes a heating device and a compressor, the heating device has a hot water inlet and a heating steam outlet, the compressor has a steam compression inlet and a steam compression outlet, the hot water inlet of the heating device is connected to the flash water outlet of the flash tank, the heating steam outlet of the heating device is connected to the steam compression inlet of the compressor, and the steam compression outlet of the compressor is used to connect to the steam inlet of the steam-consuming equipment.

[0007] In this solution, a heating device reheats the high-temperature hot water generated by flash evaporation in the flash tank, producing atmospheric-pressure steam. The steam generated by the heating device is further compressed and pressure-increased by a compressor, resulting in steam that can be used by steam-consuming equipment. This further utilizes the waste heat of the condensed water, reducing heat loss.

[0008] Furthermore, the heating device is an electric boiler.

[0009] In this solution, an electric boiler is used to heat the normal-pressure hot water obtained from the flash tank, which can effectively utilize the low-peak electricity at night and reduce electricity costs.

[0010] Furthermore, the heating device is a heat pump.

[0011] In this solution, using a heat pump for heating can reduce energy consumption.

[0012] Furthermore, the heat pump also has a heat absorption end inlet and a heat absorption end outlet. The heat absorption end inlet of the heat pump is connected to the finished product cooling water outlet of the finished product cooling device, and the heat absorption end outlet of the heat pump is connected to the finished product cooling water inlet of the finished product cooling device.

[0013] In this solution, the heat release end of the heat pump is also the heat output end for heating the hot water in the flash tank, and the heat absorption end of the heat pump is used to absorb heat from the cooling water generated by the finished product cooling device. The heat in the used cooling water is transferred to the hot water generated by the flash tank through the heat pump, which can reduce the heat waste of the cooling water used in the finished product cooling device.

[0014] Furthermore, a hot water discharge port is provided at the bottom of the heating device.

[0015] In this solution, excess hot water can be discharged through the hot water discharge port at the bottom of the heating device and can be used by other external devices, thereby reducing heat waste.

[0016] Furthermore, a sewage discharge port is provided at the bottom of the flash tank.

[0017] In this solution, part of the wastewater generated by the flash tank can be discharged through the sewage discharge port at the bottom of the flash tank.

[0018] Furthermore, the heat pump is an ultra-high temperature water source heat pump.

[0019] In this solution, the ultra-high temperature water source heat pump can utilize the heat in the hot wastewater generated in the soy sauce factory to reduce heat waste.

[0020] Furthermore, the steam-using equipment includes a high-pressure cooking pot.

[0021] In this solution, steam-using equipment refers to various equipment in the soy sauce factory that uses high-temperature steam, such as high-pressure steam cookers. This solution can recover and utilize the waste heat of the high-temperature condensed water generated by the high-pressure steam cooker.

[0022] Furthermore, the finished product cooling device is provided with a condensed water discharge port.

[0023] In this solution, the condensed water discharge port opened by the finished product cooling device can discharge the cooling waste water generated by the finished product cooling device, and it is also convenient to replace the cooling water.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The soy sauce factory waste heat recovery system of the present invention uses a flash evaporator to flash evaporate condensed water from steam-using equipment, producing hot water and steam at atmospheric pressure. The resulting steam is then combined with high-temperature, high-pressure steam through an ejector to form steam for use by the steam-using equipment. Because the steam generated from the flash evaporation of the condensed water is reused, at least a portion of the waste heat in the condensed water can be recovered.

[0026] 2. The waste heat recovery system of the soy sauce factory of the present invention mixes normal-pressure steam with high-temperature and high-pressure steam through an ejector to obtain the steam required by the steam-using equipment, so there is no need to set up additional pressure reducing equipment to reduce the pressure of the high-temperature and high-pressure steam.

[0027] 3. The utility model uses a heat pump to heat the hot water after flash evaporation into normal-pressure steam, which has low power consumption. The normal-pressure steam can be compressed and pressurized by the compressor. The high-pressure steam finally obtained is much cheaper than the steam obtained directly from the external steam pipeline, and has better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the waste heat recovery system of a soy sauce factory according to the utility model;

[0029] Figure 2 This is a schematic diagram of the existing soy sauce factory steam utilization system;

[0030] Figure 3 This is a system diagram of the finished product cooling device in an existing soy sauce factory.

[0031] In the accompanying drawings: 1. Flash tank; 11. Flash inlet; 12. Flash steam outlet; 13. Flash water outlet; 2. Ejector; 21. High-pressure inlet; 22. Low-pressure inlet; 23. Ejector outlet; 3. Heating device; 31. Hot water inlet; 32. Heating steam outlet; 33. Heat absorption end inlet; 34. Heat absorption end outlet; 4. Compressor; 41. Steam compression inlet; 42. Steam compression outlet; 100. Steam-using equipment; 101. Steam-using steam inlet; 102. Condensate outlet; 200. External steam pipeline; 300. Pressure reducing device; 400. Finished product cooling device; 401. Finished product cooling water outlet; 402. Finished product cooling water inlet; 500. Cooling tower. DETAILED DESCRIPTION

[0032] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0035] Example 1

[0036] refer to Figure 1 This embodiment discloses a waste heat recovery system for a soy sauce factory, including a flash tank 1 and an ejector 2. The flash tank 1 has a flash inlet 11, a flash steam outlet 12, and a flash water outlet 13. The ejector 2 has a high-pressure inlet 21, a low-pressure inlet 22, and an ejection outlet 23. The flash inlet 11 of the flash tank 1 is used to connect to the condensed water outlet 102 of the steam-consuming equipment 100, the flash steam outlet 12 of the flash tank 1 is connected to the low-pressure inlet 22 of the ejector 2, the high-pressure inlet 21 of the ejector 2 is used to connect to an external steam pipeline 200, and the ejection outlet 23 of the ejector 2 is used to connect to the steam inlet 101 of the steam-consuming equipment 100.

[0037] Steam-using equipment 100 refers to equipment that requires steam in a soy sauce factory, including but not limited to high-pressure steam cookers. Figure 2 Steam-consuming equipment 100 has a steam inlet 101 and a condensate outlet 102. Steam, after passing through the pressure reducing device 300, is supplied to the steam-consuming equipment 100 through the steam inlet 101. After being used by the steam-consuming equipment 100, the steam generates high-temperature, high-pressure condensate, which is discharged from the condensate outlet 102. Recovering the pressure and heat in the condensate is often difficult in existing technologies, and directly discharging the condensate can easily lead to waste.

[0038] In this embodiment, condensed water is flash evaporated in a flash tank 1 to produce hot water and steam at normal pressure. The resulting steam is mixed with high-temperature and high-pressure steam through the ejector 2 to increase its pressure, forming steam that can be used by the steam-consuming device 100.

[0039] Flash evaporation is a process in which high-pressure saturated water enters a relatively low-pressure container. Due to the sudden drop in pressure, this saturated water becomes saturated water vapor and saturated water at a portion of the container pressure. Flash tank 1 is an existing device manufactured using this principle. In this embodiment, after the high-temperature and high-pressure condensed water enters the flash tank 1, the volume suddenly expands sharply and the pressure drops to normal pressure, causing part of the condensed water to evaporate again to form normal-pressure steam. In the system of this embodiment, the high-temperature and high-pressure condensed water generated by the steam-using device 100 enters the flash tank 1, and normal-pressure steam and normal-pressure hot water are generated in the flash tank 1. After the normal-pressure steam is pressurized by the ejector 2, it can be used in the steam-using device 100, so that part of the waste heat of the condensed water generated by the steam-using device 100 can be recycled, thereby playing a role in waste heat recovery.

[0040] The ejector 2 is a device that uses a high-speed, high-energy flow to eject another low-speed, low-energy flow. The high-speed, high-energy flow can be a high-speed liquid flow, air flow, or other material flow. Specifically, in the system of this embodiment, the high-speed, high-energy flow is high-temperature, high-pressure steam transported by an external steam delivery pipeline, and the low-speed, low-energy flow is normal-pressure steam generated by the flash tank 1. By adjusting the corresponding fluid ratio, steam of appropriate pressure is obtained and re-supplied to the steam-using device. In this process, since the normal-pressure steam generated by the flash tank 1 is reused in the steam-using equipment 100, when the steam-using equipment 100 meets the steam usage demand, less high-temperature, high-pressure steam transported by the external steam pipeline 200 can be used.

[0041] The soy sauce factory waste heat recovery system of this embodiment can achieve at least the following technical benefits: First, by flashing and ejecting the condensed water, a portion of the waste heat in the condensed water can be recovered and utilized. Second, because the soy sauce factory waste heat recovery system of this embodiment uses ejector 2 to reduce the pressure of high-temperature, high-pressure steam, no additional pressure reduction equipment is required, further saving energy.

[0042] Example 2

[0043] refer to Figure 1 This embodiment is similar to Embodiment 1 and includes at least a flash tank 1 and an ejector 2. The flash tank 1 has a flash inlet 11, a flash steam outlet 12, and a flash water outlet 13. The ejector 2 has a high-pressure inlet 21, a low-pressure inlet 22, and an ejection outlet 23. The flash inlet 11 of the flash tank 1 is used to connect to the condensed water outlet 102 of the steam-consuming equipment 100. The flash steam outlet 12 of the flash tank 1 is connected to the low-pressure inlet 22 of the ejector 2. The high-pressure inlet 21 of the ejector 2 is used to connect to the external steam pipeline 200. The ejection outlet 23 of the ejector 2 is used to connect to the steam inlet 101 of the steam-consuming equipment 100.

[0044] The difference between this embodiment and Example 1 is that, in this embodiment, the soy sauce factory waste heat recovery system also includes a heating device 3 and a compressor 4, the heating device 3 has a hot water inlet 31 and a heating steam outlet 32, the compressor 4 has a steam compression inlet 41 and a steam compression outlet 42, the hot water inlet 31 of the heating device 3 is connected to the flash water outlet 13 of the flash tank 1, the heating steam outlet 32 ​​of the heating device 3 is connected to the steam compression inlet 41 of the compressor 4, and the steam compression outlet 42 of the compressor 4 is used to connect to the steam inlet 101 of the steam-consuming equipment 100.

[0045] Specifically, heating device 3 is used to heat the hot water produced by flash tank 1, generating steam. Because the hot water in flash tank 1 contains waste heat from the high-temperature condensed water generated by steam-consuming equipment 100, this waste heat is further recovered and utilized by heating device 3 and compressor 4. The steam generated by heating device 3 is compressed by compressor 4 to a higher pressure. The pressure of the compressed steam is determined by the specific requirements of steam-consuming equipment 100.

[0046] In this solution, the high-temperature hot water generated by flash evaporation in the flash tank 1 is further heated by the heating device 3 to produce normal-pressure steam. The steam generated by the heating device 3 is further compressed by the compressor 4 to produce steam for the steam-consuming equipment 100. This further utilizes the waste heat of the condensed water, reducing heat loss and thus fully utilizing the waste heat generated by the steam-consuming equipment 100.

[0047] In some embodiments, heating device 3 may be an electric boiler. This electric boiler converts electrical energy into thermal energy. It can utilize low-cost off-peak electricity at night to further heat the hot water obtained in flash tank 1 to a certain pressure and generate saturated steam. Electric boilers do not require a furnace, flue, or chimney, nor do they require fuel storage space, significantly reducing the pollution caused by conventional coal-fired boilers. Electric boilers facilitate heating the normal-pressure hot water obtained in flash tank 1.

[0048] In this embodiment, the heating device 3 is a heat pump. A heat pump is a heating device 3 that utilizes a similar operating principle to a refrigeration system. The heat pump absorbs heat from an external medium, heating the desired object. For example, in some embodiments, the heat pump can absorb heat from the high-temperature exhaust gas in a soy sauce factory to heat the hot water generated by the flash tank 1 to produce steam. In other embodiments, the heat pump can also absorb heat from hot wastewater. In this solution, using a heat pump for heating further utilizes the thermal energy within the soy sauce factory, thereby reducing energy consumption.

[0049] In some embodiments, an electric boiler is used at night to heat the atmospheric hot water obtained from the flash tank, effectively utilizing off-peak electricity prices (nighttime off-peak electricity prices are only about 20% of daytime prices). During the day, a heat pump can be considered, as its power consumption is only about one-quarter of that of electric heating, saving electricity costs. In some embodiments, a combination of an electric boiler and a heat pump can be used to increase steam production while saving costs. For example, if there is sufficient hot wastewater, a heat pump can be used as much as possible to reduce electricity consumption. At night, when off-peak electricity prices are low, an electric boiler can be used as a supplement to increase steam production and further save energy.

[0050] Furthermore, the heat pump is an ultra-high temperature water source heat pump. The ultra-high temperature water source heat pump can utilize the heat in the hot wastewater generated in the soy sauce factory to reduce heat waste. In this embodiment, the heat pump utilizes the heat of the high temperature cooling water generated by the finished product cooling device 400 of the soy sauce factory to heat the hot water generated by the flash tank 1. Figure 3 The finished product cooling device 400 is a device for cooling the finished product in the soy sauce factory. The finished product is cooled by passing cold water with a lower temperature into the finished product cooling device 400, and the cooled water is then dissipated in the cooling tower 500 and then continued to be used. The heat in this part of the cooling water will be wasted.

[0051] Specifically, in this embodiment, the heat pump further has a heat absorption end inlet 33 and a heat absorption end outlet 34. The heat absorption end inlet 33 of the heat pump is connected to the finished product cooling water outlet 401 of the finished product cooling device 400, and the heat absorption end outlet 34 of the heat pump is connected to the finished product cooling water inlet 402 of the finished product cooling device 400. In this embodiment, the heat pump transfers heat from the used cooling water to the hot water generated by the flash tank 1, thereby reducing heat waste in the cooling water used by the finished product cooling device 400.

[0052] Example 3

[0053] refer to Figure 1 This embodiment is similar to Embodiment 2 and includes at least a flash tank 1 and an ejector 2. The flash tank 1 has a flash inlet 11, a flash steam outlet 12, and a flash water outlet 13. The ejector 2 has a high-pressure inlet 21, a low-pressure inlet 22, and an ejection outlet 23. The flash inlet 11 of the flash tank 1 is used to connect to the condensed water outlet 102 of the steam-consuming equipment 100. The flash steam outlet 12 of the flash tank 1 is connected to the low-pressure inlet 22 of the ejector 2. The high-pressure inlet 21 of the ejector 2 is used to connect to the external steam pipeline 200. The ejection outlet 23 of the ejector 2 is used to connect to the steam inlet 101 of the steam-consuming equipment 100. The system also includes a heating device 3 and a compressor 4. The heating device 3 has a hot water inlet 31 and a heating steam outlet 32. The compressor 4 has a steam compression inlet 41 and a steam compression outlet 42. The hot water inlet 31 of the heating device 3 is connected to the flash water outlet 13 of the flash tank 1, the heating steam outlet 32 ​​of the heating device 3 is connected to the inlet of the compressor 4, and the steam compression outlet 42 of the compressor 4 is used to connect to the steam inlet 101 of the steam-consuming equipment 100.

[0054] The difference between this embodiment and embodiment 2 is that in this embodiment, a hot water outlet is provided at the bottom of the heating device 3. In this embodiment, excess hot water can be discharged through the hot water outlet at the bottom of the heating device 3 and can be used by other external devices, reducing heat waste.

[0055] In this embodiment, a sewage discharge port is provided at the bottom of the flash tank 1. In this embodiment, part of the wastewater generated by the flash tank 1 can be discharged through the sewage discharge port at the bottom of the flash tank 1.

[0056] In this embodiment, the finished product cooling device 400 is provided with a condensed water discharge port. In this embodiment, the condensed water discharge port provided by the finished product cooling device 400 can discharge the cooling waste water generated by the finished product cooling device 400 and facilitates the replacement of the cooling water.

[0057] The working process of the entire system is described below using a specific example. The system in this example is the waste heat recovery system of a soy sauce factory in at least one feasible embodiment above.

[0058] refer to Figure 1 The steam-using equipment 100 within the soy sauce factory generates high-temperature, high-pressure condensate after using high-temperature, high-pressure steam. This condensate enters the flash tank 1, where it flashes to produce hot water and steam at ambient pressure. On the one hand, external steam pipe 200 transports 10 MPa, 180°C, high-temperature, high-pressure steam into the soy sauce factory. This 10 MPa, 180°C, high-temperature, high-pressure steam is connected to the high-pressure inlet of ejector 2. This ejection draws in the atmospheric-pressure steam produced in flash tank 1. By adjusting the mixing ratio, 5 MPa high-temperature steam can be produced. The 5 MPa high-temperature steam produced by ejector 2 is then supplied to the steam-using equipment 100. On the other hand, the atmospheric-pressure hot water produced in flash tank 1 is heated by a heat pump to produce 110°C high-temperature steam. This 110°C high-temperature steam is compressed by compressor 4 to produce 5 MPa, 150°C steam, which is then supplied to the steam-using equipment 100. The heat pump absorbs heat from the cooling water used in the finished product cooling device 400 of the soy sauce factory. The 30°C cold water becomes 60°C hot water after passing through the finished product cooling device 400. The hot water absorbs heat from the heat pump and becomes 30°C cold water again.

[0059] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A soy sauce factory waste heat recovery system, characterized by: The invention comprises a flash tank (1) and an ejector (2), wherein the flash tank (1) has a flash inlet (11), a flash steam outlet (12) and a flash water outlet (13), and the ejector (2) has a high-pressure inlet (21), a low-pressure inlet (22) and an ejector outlet (23), wherein the flash inlet (11) of the flash tank (1) is used to connect to a condensed water outlet (102) of a steam-using device (100), the flash steam outlet (12) of the flash tank (1) is connected to the low-pressure inlet (22) of the ejector (2), the high-pressure inlet (21) of the ejector (2) is used to connect to an external steam pipeline (200), and the ejector outlet (23) of the ejector (2) is used to connect to a steam inlet (101) of the steam-using device (100).

2. The soy sauce factory waste heat recovery system according to claim 1, characterized in that: The soy sauce factory waste heat recovery system further comprises a heating device (3) and a compressor (4); the heating device (3) has a hot water inlet (31) and a heating steam outlet (32); the compressor (4) has a steam compression inlet (41) and a steam compression outlet (42); the hot water inlet (31) of the heating device (3) is connected to the flash water outlet (13) of the flash tank (1); the heating steam outlet (32) of the heating device (3) is connected to the steam compression inlet (41) of the compressor (4); and the steam compression outlet (42) of the compressor (4) is used to connect to the steam inlet (101) of the steam-using equipment (100).

3. The soy sauce factory waste heat recovery system according to claim 2, characterized in that: The heating device (3) is a heat pump.

4. The soy sauce factory waste heat recovery system according to claim 3, characterized in that: The heat pump further comprises a heat absorption end inlet (33) and a heat absorption end outlet (34); the heat absorption end inlet (33) of the heat pump is connected to a finished product cooling water outlet (401) of a finished product cooling device (400); and the heat absorption end outlet of the heat pump is connected to a finished product cooling water inlet (402) of the finished product cooling device (400).

5. The soy sauce factory waste heat recovery system according to claim 3, characterized in that: The heat pump is an ultra-high temperature water source heat pump.

6. The soy sauce factory waste heat recovery system according to claim 3, characterized in that: The heating device (3) is an electric boiler.

7. The soy sauce factory waste heat recovery system according to claim 2, characterized in that: A hot water discharge port is provided at the bottom of the heating device (3).

8. The soy sauce factory waste heat recovery system according to claim 1, characterized in that: A sewage discharge port is provided at the bottom of the flash tank (1).

9. The soy sauce factory waste heat recovery system according to claim 1, characterized in that: The steam-using equipment (100) includes a high-pressure cooking pot.

10. The soy sauce factory waste heat recovery system according to claim 4, characterized in that: The finished product cooling device (400) is provided with a condensed water discharge port.

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